Simple, Low-Cost Molecular Assays for TR34/L98H Mutations in the cyp51A Gene for Rapid Detection of Triazole-Resistant Aspergillus fumigatus Isolates

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Simple, low-cost molecular assays for TR34/L98H mutations in the cyp51A gene for rapid detection of triazole-resistant Aspergillus fumigatus isolates.

Simple, low-cost PCR/PCR-restriction fragment length polymorphism (RFLP) assays targeting cyp51A promoter and codon 98 regions were developed for the detection of triazole-resistant Aspergillus fumigatus strains carrying TR34/L98H mutations. The assays were evaluated using 40 itraconazole-susceptible isolates and 35 itraconazole-resistant isolates. The prevalence of TR34/L98H mutations in clini...

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Comparison of Two Molecular Assays for Detection and Characterization of Aspergillus fumigatus Triazole Resistance and Cyp51A Mutations in Clinical Isolates and Primary Clinical Samples of Immunocompromised Patients

Citation: Postina P, Skladny J, Boch T, Cornely OA, Hamprecht A, Rath P-M, Steinmann J, Bader O, Miethke T, Dietz A, Merker N, Hofmann W-K, Buchheidt D and Spiess B (2018) Comparison of Two Molecular Assays for Detection and Characterization of Aspergillus fumigatus Triazole Resistance and Cyp51A Mutations in Clinical Isolates and Primary Clinical Samples of Immunocompromised Patients. Front. M...

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Efficacy of posaconazole against three clinical Aspergillus fumigatus isolates with mutations in the cyp51A gene.

The in vivo efficacy of posaconazole against 4 clinical Aspergillus fumigatus isolates with posaconazole MICs ranging from 0.03 to 16 mg/liter, as determined by CLSI method M38A, was assessed in a nonneutropenic murine model of disseminated aspergillosis. The underlying resistance mechanisms of the isolates included substitutions in the cyp51A gene at codon 220 (M220I), codon 54 (G54W), and cod...

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Rapid detection of triazole antifungal resistance in Aspergillus fumigatus.

Triazole resistance in Aspergillus fumigatus is an uncommon but rising phenomenon. Susceptibility testing is rarely performed and can take 48 h or longer, which is an impediment to effective therapy. Molecular diagnostic probing of well-defined resistance mechanisms, which serve as surrogate markers, provides an alternative approach to rapidly (within hours) and efficiently identify resistant s...

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Multiple cyp51A-based mechanisms identified in azole-resistant isolates of Aspergillus fumigatus from China.

Seventy-two A. fumigatus clinical isolates from China were investigated for azole resistance based on mutations of cyp51A. We identified four azole-resistant strains, among which we found three strains highly resistant to itraconazole, two of which exhibit the TR34/L98H/S297T/F495I mutation, while one carries only the TR34/L98H mutation. To our knowledge, the latter has not been found previousl...

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ژورنال

عنوان ژورنال: Journal of Clinical Microbiology

سال: 2014

ISSN: 0095-1137

DOI: 10.1128/jcm.00408-14